etoile
exoplanètes
Nouvelles
Latest astronomy nouvelles
Restez informé(e) des dernières actualités astronomiques, des découvertes sur les étoiles et les exoplanètes, et des recherches en cours. Découvrez de nouveaux articles sur l'astronomie.
31. 5. 2026
Étoiles | Exoplanètes | Naines brunes | TESSAstronomers discovered and characterized TOI-7154b, a massive brown dwarf orbiting close to its host star, TOI-7154. Initially flagged as a planet candidate by TESS, follow-up radial velocity measurements revealed its true sub-stellar nature. TOI-7154b is nearly as massive as the hydrogen-burning limit that separates brown dwarfs from very low-mass stars, but its radius is smaller than Jupiter’s. The brown dwarf orbits a metal-rich G-type star in an eccentric orbit, and the system is very old, a...
Read article 
Advertisement
31. 5. 2026Étoiles | ExoplanèteResearchers combined space-based K2 and TESS photometry with high-resolution HERMES spectroscopy to study four bright stars: HD 73135, BD +19° 2045, BD +19° 2046, and TYC 1395-855-1. Their analysis clarified the stars’ variability, chemical properties, and evolutionary status. HD 73135 shows a persistent modulation near 1.5 days, likely due to rotation, but an ellipsoidal-binary scenario is also possible. BD +19° 2045 is identified as a new candi...
Read article 31. 5. 2026Étoiles | ExoplanèteResearchers have upgraded the Exo-REM atmospheric model to better simulate the complex, patchy clouds found in brown dwarfs and exoplanets. The new Exo-REM k26 grids include a cloud sedimentation parameter, improved molecular opacities, and stricter convergence criteria, allowing for more accurate modeling of objects with heterogeneous cloud cover. Applying this model to VHS 1256 b, a variable brown dwarf, the team found that a two-column approac...
Read article 30. 5. 2026Étoiles | ExoplanèteResearchers analyzed data from Kepler, TESS, and HARPS-N to study KIC 9139163, a solar-type pulsating star. They found evidence for a close-in, non-transiting planet with a mass of about 7.3 Earth masses and a radius of 2.43 Earth radii, placing it in the so-called Neptunian desert—a region where such planets are rare. The planet likely has a water-rich composition and may have lost its original hydrogen/helium envelope or developed a metal-rich ...
Read article 30. 5. 2026Étoiles | ExoplanèteHD 142527’s planet-forming disk is famous for its asymmetric dust trap, shadows, and spiral arms. Using new ALMA observations, researchers mapped a wide range of molecules and found that emissions from H₂CO, CN, and C₂H are concentrated in spiral-like features in the southern disk, opposite the dust trap. These features are not linked to the disk’s shadows but are likely caused by late infall of carbon-rich material, which boosts the local carbon...
Read article 30. 5. 2026Étoiles | ExoplanèteAU Mic is a young, nearby star with two Neptune-sized planets and a debris disk. Researchers observed back-to-back transits of both planets, AU Mic b and c, using multiple telescopes and measured their spin-orbit alignment with the Rossiter-McLaughlin effect. They confirmed that planet b’s orbit is well aligned with the star’s rotation, while planet c’s orbit is likely aligned but a polar orbit cannot be ruled out due to data limitations.
The ...
Read article 30. 5. 2026Étoiles | ExoplanèteThe 14 Herculis system contains two super-Jupiter planets on eccentric, misaligned orbits—a configuration that is difficult to explain with standard planet formation models. Researchers used N-body simulations to study the system’s history and found that its current architecture can be reproduced if the system originally hosted additional massive planets that were later ejected through planet-planet scattering. The mass of the ejected planet help...
Read article 27. 5. 2026Étoiles | Exoplanètes | Exoplanètes habitableThis study analyzes the orbital dynamics and habitability of the HD 20794 planetary system, which contains three confirmed planets orbiting a nearby G-type star. Of particular interest is HD 20794 d, a terrestrial planet with a minimum mass of 5.82 Earth masses on a highly eccentric orbit that passes through the star’s habitable zone (HZ). The research calculates the HZ boundaries and determines how much time planet d spends within these limits. ...
Read article 27. 5. 2026Étoiles | ExoplanèteScientists modeled the interiors and atmospheres of the exoplanets TRAPPIST-1f, g, and h to see if they could sustain subsurface oceans and produce detectable water vapor through cryovolcanism. Using simulations, they found that all three planets’ internal heat is mainly generated by radioactive decay and tidal forces. TRAPPIST-1f and g are likely to have thin outer ice shells and shallow subsurface oceans, while TRAPPIST-1h may have a thicker ic...
Read article 27. 5. 2026Étoiles | ExoplanèteResearchers observed the protoplanetary disk around the young star AB Aurigae using near-infrared polarized imaging and H-alpha observations over several years. Their study reveals that while most of the disk follows Keplerian rotation, the inner regions (within about 60 astronomical units) show significant deviations, including sub-Keplerian motion. Two bright spiral arms inside the disk’s millimeter cavity display different dynamic behaviors, p...
Read article Top article categories
Filtered articles by category.
Exoplanètes nouvellement découvertes
| EK Chamaeleontis b | 10 / 2026 | 2702.2 M⊕ | 321.3 ly | |
| HD 715 b | 10 / 2026 | 201.9 M⊕ | 542.8 ly | |
| DENIS J1253-5709 b | 10 / 2026 | 244.8 M⊕ | 54.4 ly | |
| TOI-6417 b | 09 / 2026 | 349.7 M⊕ | 1903.9 ly | |
| TOI-6443 b | 09 / 2026 | 1605.4 M⊕ | 2051.6 ly | |
| TOI-7219 b | 09 / 2026 | 661 M⊕ | 1074.2 ly | |
| TOI-4079 B b | 09 / 2026 | 1646.8 M⊕ | 1185.6 ly | |
| HD 45652 b | 09 / 2026 | 1557.7 M⊕ | 113.9 ly | |
| LSPM J0804+1116 b | 09 / 2026 | 6.4 M⊕ | 82.6 ly | |
| HR 8799 f | 09 / 2026 | 524.5 M⊕ | 133.3 ly | |
| 61 Cygni A b | 09 / 2026 | 2543.3 M⊕ | 11.4 ly | |
| TOI-5646 b | 08 / 2026 | 45.9 M⊕ | 1352.3 ly | |
| TOI-4468 c | 08 / 2026 | 11.1 M⊕ | 1233.1 ly | |
| TOI-4468 b | 08 / 2026 | 170.1 M⊕ | 1233.1 ly | |
| TOI-4468 d | 08 / 2026 | 311 M⊕ | 1233.1 ly |
Newly discovered exoplanets
Latest scientific studies
Parcourez les dernières études scientifiques sur les étoiles et les exoplanètes de notre galaxie. Découvrez les dernières recherches en astrophysique et en astronomie stellaire.
Publications plus anciennes